It appears HTC isn't the only company to have phones unavailable in the U.S. due to patent issues, as Motorola is apparently also infringing a Microsoft patent.
The ruling was made by the International Trade Commission, who had ruled on the HTC One X and HTC Evo 4G bans in the U.S. Following the news, HTC's shares had dropped by 6 percent. Some phones were available, but AT&T quickly changed the status of the phone to 'out of stock.'
Specific Motorola models haven't been detailed, though Microsoft has asked for numerous devices to not cross the U.S. border: the Motorola Atrix, Backflip, Bravo, Charm, Cliq, Cliq 2, Cliq XT, Defy, Devour, Droid 2, Droid 2 Global, Droid Pro, Droid X, Droid X2, Flipout, Flipside, Spice and the Motorola Xoom tablet.
The infringing patent covers the ability for users to generate meeting requests and gatherings using mobiles. Google is working to acquire Motorola.
"Although we are disappointed by the commission's ruling that certain Motorola Mobility products violated one patent, we look forward to reading the full opinion to understand its reasoning. We will explore all options include appeal," the company said in an e-mailed statement according to Reuters.
Microsoft added it's pleased with the ruling, and hopes Motorola will take a license on its patent. Microsoft filed a complaint in 2010, accusing Motorola of infringing nine patents across Windows Mobile and Windows Phone.
An International Trade Commission judge, in December, found Motorola infringed on just one patent. It was not guilty of six, and dropped two.
Motorola shipped 8.6 million Android devices during Q1 2012, according to research firm Gartner. The firm revealed Android is the most popular smartphone operating system, taking 56 percent market share in the same quarter.
The International Trade Commission can stop devices from being imported if they infringed on patents.
